Gemini 3.1 Pro vs o3
Wins 8 of 8 areas
Coding · Agents · Reasoning · Facts · Images and charts · Math · Long documents · Following instructions
Wins 0 of 8 areas
—
Gemini 3.1 Pro is the stronger all-rounder.o3 is cheaper.
Scores updated · 32 tests both models report · How we compare
Where each one wins
Tests won in each of the eight areas we test. Each piece is one test, so a longer bar means more evidence; grey means the two scored within a point of each other.
- ReasoningHard problems that need careful thinking50Gemini 3.1 Pro5 of 5 tests
- Images and chartsUnderstanding pictures, charts and video40Gemini 3.1 Pro4 of 4 tests
- CodingWriting and fixing software30Gemini 3.1 Pro3 of 3 tests
- FactsGetting facts right instead of making them up30Gemini 3.1 Pro3 of 3 tests
- AgentsCarrying out multi-step tasks on its own20Gemini 3.1 Pro2 of 2 tests
- Following instructionsDoing exactly what it is asked20Gemini 3.1 Pro2 of 2 tests
- MathCompetition and research-level math10Gemini 3.1 Pro1 of 1 test
- Long documentsFinding answers in very long texts10Gemini 3.1 Pro1 of 1 test
Math and long documents rest on a single test each.
What it costs
Prices per million tokens, roughly 750,000 words. The bars show the cost of a million tokens read plus a million written.
o3 costs 29% less for the same work.
The biggest differences
The tests each model wins by the widest margin, up to three each. Scores are out of 100.
Where Gemini 3.1 Pro pulls ahead
- Abstract visual puzzles that people can solveARC-AGI-2+70.6points ahead
- Avoids making up answers it doesn't knowAA-Omniscience · Non-hallucination+37.2points ahead
- Finds hard-to-locate facts by browsing the webBrowseComp+36.2points ahead
Where o3 pulls ahead
No clear win on a test scored out of 100.
Every test, side by side
All 32 tests both models report. The winning score is in its model's colour; marks a score checked independently.
CodingGemini 3.1 Pro
- SciCodeGemini 3.1 Pro by 17.758.741+17.7
- Terminal-Bench HardGemini 3.1 Pro by 16.753.837.1+16.7
- SWE-bench VerifiedGemini 3.1 Pro by 11.580.669.1+11.5
AgentsGemini 3.1 Pro
- BrowseCompGemini 3.1 Pro by 36.285.949.7+36.2
- GDPValGemini 3.1 Pro by 1.914.712.8+1.9
ReasoningGemini 3.1 Pro
- ARC-AGI-2Gemini 3.1 Pro by 70.677.16.5+70.6
- Humanity's Last ExamGemini 3.1 Pro by 26.94720.1+26.9
- SimpleBenchGemini 3.1 Pro by 26.579.653.1+26.5
- CritPtGemini 3.1 Pro by 16.617.71.1+16.6
- GPQA DiamondGemini 3.1 Pro by 11.494.182.7+11.4
FactsGemini 3.1 Pro
- AA-Omniscience · Non-hallucinationGemini 3.1 Pro by 37.249.111.9+37.2
- SimpleQA VerifiedGemini 3.1 Pro by 24.173.549.4+24.1
- AA-Omniscience · AccuracyGemini 3.1 Pro by 16.354.938.6+16.3
Images and chartsGemini 3.1 Pro
- MMMU-ProGemini 3.1 Pro by 12.382.470.1+12.3
- LMArena · VisionGemini 3.1 Pro by 82 rating points12961214+82 rating
- CharXiv (RQ)Gemini 3.1 Pro by 4.783.378.6+4.7
- MathVistaGemini 3.1 Pro by 3.490.286.8+3.4
Following instructionsGemini 3.1 Pro
- Multi-ChallengeGemini 3.1 Pro by 1171.460.4+11
- IFBenchGemini 3.1 Pro by 5.777.171.4+5.7
Other results11 tests, not counted
Tests outside the eight areas. They are not counted above: several are summary scores built from other tests, or the same test under another name.
- AA-OmniscienceGemini 3.1 Pro by 47.431.9-15.6+47.4
- ARC-AGI-1Gemini 3.1 Pro by 37.29860.8+37.2
- Artificial Analysis Coding IndexGemini 3.1 Pro by 30.468.838.4+30.4
- AA Agentic Indexo3 by 25.810.336.1+25.8
- τ²-Bench Telecom (AA run)Gemini 3.1 Pro by 14.995.680.7+14.9
- frontiermath_tier_4_v1Gemini 3.1 Pro by 14.616.72.1+14.6
- AA IntelligenceGemini 3.1 Pro by 9.529.720.2+9.5
- LiveCodeBenchGemini 3.1 Pro by 791.784.7+7
- ERQAGemini 3.1 Pro by 6.870.864+6.8
- MMLU-ProGemini 3.1 Pro by 69185+6
- StrongREJECTGemini 3.1 Pro by 19897+1
Questions people ask
Which is better, Gemini 3.1 Pro or o3?
Gemini 3.1 Pro wins all eight areas we test: coding, agents, reasoning, facts, images and charts, math, long documents and following instructions. o3 wins none, but costs 29% less.
Which is better for coding?
Gemini 3.1 Pro. It wins 3 of the 3 coding tests both models report; o3 wins none.
Which is cheaper?
Gemini 3.1 Pro costs $2.00 per million input tokens and $12.00 per million output tokens; o3 costs $2.00 and $8.00. That makes o3 about 29% cheaper for the same work.
How do you compare the two?
We use the 32 benchmark tests both models have published scores on. The verdict counts the 21 tests in the eight capability areas, and a gap under one point (ten on rating-style scales) counts as a tie. The other 11 are listed but not counted, because several are summary scores or repeat a test. Each score is the one shown on the model's own page.